Viewing file:  plugin_uncore.py (4.61 KB) -rw-r--r--
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from . import hotplug
from .decorators import *
import tuned.logs
from tuned.utils.commands import commands
import os
import fnmatch
log = tuned.logs.get()
cmd = commands()
SYSFS_DIR = "/sys/devices/system/cpu/intel_uncore_frequency/"
IS_MIN = 0
IS_MAX = 1
class UncorePlugin(hotplug.Plugin):
"""
`uncore`::
`max_freq_khz, min_freq_khz`:::
Limit the maximum and minumum uncore frequency.
Those options are Intel specific and correspond directly to `sysfs` files
exposed by Intel uncore frequency driver.
====
----
[uncore]
max_freq_khz=4000000
----
Using this options *TuneD* will limit maximum frequency of all uncore units
on the Intel system to 4 GHz.
====
"""
def _init_devices(self):
self._devices_supported = True
self._assigned_devices = set()
self._free_devices = set()
self._is_tpmi = False
try:
devices = os.listdir(SYSFS_DIR)
except OSError:
return
# For new TPMI interface use only uncore devices
tpmi_devices = fnmatch.filter(devices, 'uncore*')
if len(tpmi_devices) > 0:
self._is_tpmi = True # Not used at present but can be usefull in future
devices = tpmi_devices
for d in devices:
self._free_devices.add(d)
log.debug("devices: %s", str(self._free_devices))
def _instance_init(self, instance):
instance._has_static_tuning = True
instance._has_dynamic_tuning = False
def _instance_cleanup(self, instance):
pass
def _get(self, dev_dir, file):
sysfs_file = SYSFS_DIR + dev_dir + "/" + file
value = cmd.read_file(sysfs_file)
if len(value) > 0:
return int(value)
return None
def _set(self, dev_dir, file, value):
sysfs_file = SYSFS_DIR + dev_dir + "/" + file
if cmd.write_to_file(sysfs_file, "%u" % value):
return value
return None
@classmethod
def _get_config_options(cls):
return {
"max_freq_khz": None,
"min_freq_khz": None,
}
def _validate_value(self, device, min_or_max, value):
try:
freq_khz = int(value)
except ValueError:
log.error("value '%s' is not integer" % value)
return None
try:
initial_max_freq_khz = self._get(device, "initial_max_freq_khz")
initial_min_freq_khz = self._get(device, "initial_min_freq_khz")
max_freq_khz = self._get(device, "max_freq_khz")
min_freq_khz = self._get(device, "min_freq_khz")
except (OSError, IOError):
log.error("fail to read inital uncore frequency values")
return None
if min_or_max == IS_MAX:
if freq_khz < min_freq_khz:
log.error("%s: max_freq_khz %d value below min_freq_khz %d" % (device, freq_khz, min_freq_khz))
return None
if freq_khz > initial_max_freq_khz:
log.info("%s: max_freq_khz %d value above initial_max_freq_khz - capped to %d" % (device, freq_khz, initial_max_freq_khz))
freq_khz = initial_max_freq_khz
elif min_or_max == IS_MIN:
if freq_khz > max_freq_khz:
log.error("%s: min_freq_khz %d value above max_freq_khz %d" % (device, freq_khz, max_freq_khz))
return None
if freq_khz < initial_min_freq_khz:
log.info("%s: min_freq_khz %d value below initial_max_freq_khz - capped to %d" % (device, freq_khz, initial_min_freq_khz))
freq_khz = initial_min_freq_khz
else:
return None
return freq_khz
@command_set("max_freq_khz", per_device = True)
def _set_max_freq_khz(self, value, device, sim, remove):
max_freq_khz = self._validate_value(device, IS_MAX, value)
if max_freq_khz is None:
return None
if sim:
return max_freq_khz
log.debug("%s: set max_freq_khz %d" % (device, max_freq_khz))
return self._set(device, "max_freq_khz", max_freq_khz)
@command_get("max_freq_khz")
def _get_max_freq_khz(self, device, ignore_missing=False):
if ignore_missing and not os.path.isdir(SYSFS_DIR):
return None
try:
max_freq_khz = self._get(device, "max_freq_khz")
except (OSError, IOError):
log.error("fail to read uncore frequency values")
return None
log.debug("%s: get max_freq_khz %d" % (device, max_freq_khz))
return max_freq_khz
@command_set("min_freq_khz", per_device = True)
def _set_min_freq_khz(self, value, device, sim, remove):
min_freq_khz = self._validate_value(device, IS_MIN, value)
if min_freq_khz is None:
return None
if sim:
return min_freq_khz
log.debug("%s: set min_freq_khz %d" % (device, min_freq_khz))
return self._set(device, "min_freq_khz", min_freq_khz)
@command_get("min_freq_khz")
def _get_min_freq_khz(self, device, ignore_missing=False):
if ignore_missing and not os.path.isdir(SYSFS_DIR):
return None
try:
min_freq_khz = self._get(device, "min_freq_khz")
except (OSError, IOError):
log.error("fail to read uncore frequency values")
return None
log.debug("%s: get min_freq_khz %d" % (device, min_freq_khz))
return min_freq_khz
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